Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

612
FXUS63 KLOT 312337
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
637 PM CDT Tue Mar 31 2026

.KEY MESSAGES...

- Scattered showers and thunderstorms through this evening ahead
  of a strong cold front with falling temps behind the front.

- Possible very windy Thursday with southerly winds gusting
  40-45 mph.

- Possible strong to severe thunderstorms ahead of a cold front
  Thursday afternoon/evening.

- An active pattern will continue through Saturday with periods
  of showers and thunderstorms.

&&

.DISCUSSION...
Issued at 206 PM CDT Tue Mar 31 2026

The cold front has moved into far northern IL and will continue
moving south across the area through this evening. Winds will
shift northerly behind the front, more northeasterly near Lake
Michigan, with temperatures falling into the 40s, and likely
into the 30s near Lake Michigan.

Showers and scattered thunderstorms are expected to increase in
coverage as the cold front moves across the area. There remains
quite a bit of uncertainty for the potential for additional
severe thunderstorms and the most favored area appears to be
along and south of I-80 through early/mid evening. While a line
of showers and thunderstorms behind the front across southern WI
is expected to move across the area, this activity is not
expected to be severe. Latest model trends would suggest that
the precipitation well end completely for areas north of I-80
tonight with perhaps scattered activity continuing overnight
across the southern half or third of the area. This
precipitation may continue into Wednesday morning, again for
areas south of I-80 but overall, the northern half or so of the
area is looking dry through midday Wednesday with precipitation
chances increasing Wednesday afternoon into Wednesday night as
the cold front lifts back north as a warm front. Confidence
remains low for timing and coverage of activity Wednesday night
into Thursday morning. Blended pops are generally in the 70-100%
range and while this is plausible, the timing/duration will
likely be considerably shorter and later forecasts will be able
to narrow down these chances

Precipitation should end sometime Thursday morning as the warm
front lifts north of the area. Strong southerly winds are
expected to develop with gusts into the 40-45 mph range
possible, which would be approaching wind advisory criteria if
these winds do materialize. High temperatures are likely to warm
well into the 70s on Thursday.

A cold front will move through the area late Thursday afternoon
into Thursday evening with showers and thunderstorms expected
along/ahead of this front. Day 3 outlook has level 2 for severe
storms across the southeast two thirds of the area and this
looks on track. Thursday night into Friday appears to be a short
break in the precipitation with another period of showers and
thunderstorms Friday night into Saturday ahead of another strong
cold front that is expected to move across the area Saturday.
Colder air will spread across the area for Sunday/Monday and the
models are now showing another clipper like system and possible
precipitation Monday night. cms

&&

.AVIATION /00Z TAFS THROUGH 06Z THURSDAY/...
Issued at 637 PM CDT Tue Mar 31 2026

Aviation forecast concerns for the 00Z TAFs:

- Few lingering SHRA early this evening, though TSRA threat
  looks to remain east/south of the terminals beyond 00Z.

- Prevailing MVFR ceilings expected for much of the period with
  breezy NNE winds occasionally gusting 20-25 kts. Exception
  will be RFD which will enjoy a period of VFR conditions this
  evening and again Wednesday.

- Can`t rule out some spotty non-impactful SHRA at times
  Wednesday, though greatest potential for RA/SHRA at terminals
  looks to be in the afternoon and especially Wednesday evening.

Surface cold front has pushed south of the terminals as of early
evening, with winds having shifted to the north-northeast. Winds
will remain from the northeast through the remainder of the
period, remaining breezy with gusts 20-25 kts at times. Low-
level cooler air off of Lake Michigan will also support a
prolonged period of MVFR ceilings (possibly some brief IFR this
evening) for the Chicago terminals. RFD, further from the lake,
will see periods of VFR this evening and again on Wednesday.

A few spotty showers remain along a line from roughly KVYS-KMDW
at issuance time, though these should be moving east/south of
the terminals shortly. Even a brief TS at MDW recently, though
any further TS expected to remain east/south of the terminals
and should not continue to be a factor in the immediate vicinity
of the terminals. Can`t rule out a few spotty showers during the
day Wednesday across the terminals, but greatest chances appear
to be during the afternoon and especially Wednesday evening, as
a warm front lifts toward the area.

Ratzer

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory until 7 PM CDT Wednesday for the IL and
     IN nearshore waters.

&&

$$

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